Location: San Jose, California
Square footage: 24,000
Price: It cost $5.5 million to build from 1884 to 1922 ($83.6 million today).
Lore and legend: In 1885, Sarah Winchester, heir to half of the Winchester Repeating Arms Company, moved from Connecticut to California following the untimely death of her husband. It wasn't the only tragedy in her life. She was still grieving from the loss of her infant daughter, who died from marasmus 15 years before her husband passed.
Legend has it that a medium told Sarah she was being haunted by angry spirits murdered by Winchester rifles. To appease the ghosts — and to confuse them — she continually built onto an unfinished cottage in San Jose, California, for years. The house was never finished. By the time of her death, the mansion had 160 rooms, 10,000 panes of glass, 17 chimneys and 47 fireplaces.
At one point, it was seven stories tall, but an earthquake ruined several floors. One theory is that Sarah wasn't trying to avoid ghosts, but instead had the ruined rooms sealed away, creating passages to nowhere.
But even if she weren't running from ghosts, why build something so strange? Shortly after Sarah died, the house sold at auction for a mere $135,000, even though it cost around $5.5 million to build (that's about $83.6 million in today's money). Today, the house is a tourist attraction.